She was discovered at the beginning of the 1960s through a talent competition, but still took time to graduate from a bank apprenticeship in spite of her early success.

She sang for several pop groups, such as The Family Dogg also was a member of Gulivers People a resident band at Tiffany’s in Londons west end, before she devoted herself from 1970 onwards to her solo career, focusing mainly on Germany.

Sheer became a guest on several different television music-shows, including several appearances on ZDF Hitparade, one of Germany's most popular music programs.

She took part in the contest two other times, in which she did not progress beyond the German preliminaries or finals: in 1976 with "Einmal Wasser, einmal Wein" ("Once Water, Once Wine") and in a 2002 duet with Bernhard Brink, singing "Es ist niemals zu spät" ("It Is Never Too Late").

Besides her solo performances, Sheer also sang a number of duets with her ex-husband Gavin du Porter, and her colleague, Bernhard Brink.